Cascaded automatic generation control method for hydropower station group

Abstract

The invention discloses a cascaded automatic generation control method for a hydropower station group and belongs to the technical field of hydraulic and electric engineering. The automatic generation control method comprises the following steps: selecting hydropower stations and carrying out classification and topological relation treatment on the hydropower stations; setting related initial conditions; determining a vibration zone of the hydropower stations and output correction modes; decomposing a cascaded real-time load to obtain a basic load (EDC) component and an adjusting load (ACE) component, and judging whether a cascaded EDC model is invoked or not according to real-time information deviation; constructing the cascaded EDC model to distribute the EDC component; constructing a narrow-sense cascaded AGC model to distribute the AGE component; and obtaining real-time set outputs of the cascaded hydropower stations. According to the method disclosed by the invention, the counter adjusting effect of a daily adjustment hydropower station is fully exerted to coordinate cascaded pitch peak and frequency modulation operation. The cascaded load EDC component and the ACE component are respectively distributed, so that the problem of massive load transfer is effectively avoided, and the economical benefit and the safety of the cascaded hydropower stations are ensured. Therefore, the engineering practicality of the method disclosed by the invention is further enhanced.

Description

technical field [0001] The invention belongs to the technical field of water conservancy and electric power, and more specifically relates to an automatic power generation control method for cascade hydropower station groups. Background technique [0002] The purpose of cascade automatic generation control (AGC) is to safely and economically distribute the real-time load of the power grid to each hydropower station in the cascade, which is similar to the cascade short-term power generation optimization dispatch task. Therefore, in the prior art, the cascade AGC mathematical model is usually established by referring to the cascade short-term optimal scheduling model, but the calculation period is shortened to ensure the real-time requirements of the cascade AGC. However, the above method has the following technical defects: (1) The boundary conditions of the cascade AGC model, such as the total load of the cascade, the water level of the upper reservoir, and the inflow flow, ...

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Problems solved by technology

However, the above method has the following technical defects: (1) The boundary conditions of the cascade AGC model, such as the total load of the cascade, the water level of the upper reservoir, and the inflow flow, etc., small real-time changes will cause the load distributed between the cascade hydropower stations to change drastically in continuous time , resulting in a large-scale transfer of loads between plants; (2) Although the use of equal water consumption distribution methods can solve the problems in (1), in practical applications, this method will cause the upstream and downstream hydropower stations to go out of the storage and storage due to the arrival time of the water flow. It cannot be synchronized, and the anti-regulation effect of the downstream hydropower station cannot be brought into play, resulting in the conflict between cascade peak regulation and frequency regulation operation; (3) Static modeling with a single station unit as the object to deal with the problem of vibration area may lead to the load distribution of a cascade hydropower station The state of some units has to be in the vibration zone, and the influence of the change of the number of hydropower units in operation during the operation of the cascade AGC on the scope and position of the vibration zone of the whole plant is ignored; (4) When facing large watershed cascades, the number of hydropower stations is large In the case of a dynamic programming algorithm to solve the above model, the load distribution calculation on the current power grid computer hardware platform cannot meet the real-time requirements due to the problem of "dimension barrier".

The above-mentioned technical defects all make the existing cascade automatic power generation control technology methods not perfect and mature enough in practical engineering applications

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